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6.2 Blood System (:star: Blood flows through tissue in capillaries with…
6.2 Blood System
:star: Blood flows through tissue in capillaries with permeable walls that allow exchange of materials between cells in the tissue
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:check: consist of one layer of endothelium cells, coated by a filter-like protein gel, with pores between cells (only tunica intima)
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:check: permeability differ between tissues, enabling particular proteins and large particles to reach certain tissues
Heart Structure
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:<3: each side; a ventricle - pumps blood out into arteries an atrium - collects blood from veins and pass to ventricle
:<3: each side; atrioventricular valve between atrium & ventricle , semilunar valve between ventricle and artery
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:<3: Deoxygenated blood flows into right side of heart through vena cava and out through pulmonary artery
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Veins
:star: Veins collect blood at low pressure from the tissues of the body and return it to the atria of the heart
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:check: Blood flow is assisted by gravity and by pressures exerted on them by other tissues especially skeletal muscles
:check: Contraction makes a muscle shorter and wider so it squeezes on adjacent veins like a pump (e.g: walking, sitting - improves venous blood flow)
:check: Each part of the body is served by one/more veins (e.g: subclavian veins, jugular veins) [hepatic portal vein does not carry blood back to heart, but from stomach to liver]
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